Lens



J. F. LEWIS Nov. 7, 1933.

LENS

Filed 0 01;. 25, 1930 dZkmil-liewzs Mommas.

Patented Nov. 7, 1933 UNITED STATES PATENT OFFICE This invention aims toprovide a lens in which necessary changes may be made quickly andconveniently, to correspond with changes in light, defects in vision andthe like, through the instrumentality of an insert, novel means beingprovided for holding the insert in place.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the inventionappertains.

With the above and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, may be made within thescope or what is claimed, without departing from the spirit or theinvention.

In the accompanying drawing: Figure 1 is an elevation showing a lensconstructed in accordance with the invention;

Figure 2 is a section on the line 2-2 of Figure 1;

Figure 3 is a section on the line 8-3 of Figure 1;

Figure 4 is a plan showing a modified insert; Figure 5 is a longitudinalsection of the insert depicted in Figure 4.

In carrying out the invention, there is provided a lens 1 having areduced rib 2 about its periphery. In the lens 1 there is an inwardlyextended parallel-sided notch 3, the irmer end of which may be roundedas shown at 4. The notch 3 has a reduced rib 5 about its edge,constructed like the rib 2 of the lens 1, this similarity in the ribs 5and 2 reducing the cost oi grinding the lens. The notch 3 preferablyextends inwardly somewhat beyond the optical center 6 of the lens 1, 40as shown in Figure 1.

An insert '7 is slidably and removably mounted in the notch 3 and isshaped to correspond with the notch, the insert having a groove 8 on itssides and on its inner end which corresponds in shape to the rib 5 .0!the notch 3. The outer endoitheinsert'lhasaribiiwhichisshaped like theedge 2 or the lens 1.

The lens 1 may be made in any size and thickness, to fill requirementsfor any kind of service, and to flt any kind or style of frame which theuser may select. The lens 1 may be colored or tinted any preferred hue.The insert 7 preferably 0 is a piece of clear glass. The vision of theuser may range any place through the clear glass insert 7, and in caseof facing a bright light, the user can tilt his head down or sidewise asmall amount and look through the colored lens 1, the light beingmodified accordingly, and the glare which comes from headlights or fromany other source may be ameliorated. The device is of use not only inconnection with headlights, in driving an automobile or an engine, but,as well, may be employed by persons who work about kilns, blow torchesand the like.

In Figures 4 and 5 parts hereinbefore described have been designated bynumerals previously used with the suilix a. Although no effort has beenmade to show the many forms which the insert may take, it will beobserved that the insert 7a is thickened at 10 to indicate that it maybe so constructed as to correct any defect in vision, or to providebi-i'ocal advantages.

Owing to the particular form oi. the inserts "I and m, as to outline,they will hold their place readily and be capable of insertion andremoval more readily than the ordinary bi-iocal' inserts, and when thelens 1 is enclosed in a suitable frame, the use of cement will not benecessary to hold the insert in place.

Having thus described the invention, what is claimed is:

A spectacle lens having a notch in its lower edge, and an insert fillingthe notch, the entire part oi the lens which bounds the notch, and thecorresponding edge portions of the insert, being tongue-and-groovedtogether, to provide for a slidable removal of the insert, the peripheryof the lens being ribbed, and the outer end of the insert being ribbedto correspond with the ribbed periphery of the lens, the ribsduplicating the tongue, in cross section.

i JOHN LEWIS.

